[求助]新手求助~（关于初级的神经网络问题） [复制链接]

各位大虾，我在网上看到的教程里的一个程序段，本来想要试试看的： p~q_0Pg%  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); >[XOMKgQ](  
net.trainParam.show = 50; hGA!1a4 c  
net.trainParam.lr = 0.05;
K\KO5A  
net.trainParam.epochs = 300; AZy~Q9Kc  
net.trainParam.goal = 1e-5; NB+$ym  
p = [-1 -1 2 2;0 5 0 5]; \'??  
t = [-1 -1 1 1]; c[h'`KXJf-  
net=train(net,p,t); c. TB8Ol  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 otz_nF;E  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 >2lAy:B5  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 QypiF*fSU  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 3j+=3n,  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 <RoX|zJ
w  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 V+=*2?1  
TRAINGD, Performance goal met. v$)@AE  
a = sim(net,p) JMirz~%ib  
plot(p,t,p,a,'o') lbKv  
但是为什么老是报错： 6)#- 5m  
??? Input argument "net" is undefined. \za5:?[xB